Protective sleeve for resistor connecter device



A. A. LEONARP 2,045,361

R CONNECTER DEVICE June 23, 1936.

PROTECTIVE SLEEVE FOR RESISTO Filed Jan. 15, 1952 WWW/l Patented June 23, 1936 UNITED STATES PROTECTIVE SLEEVE FOR RESISTOR CONNECTER DEVICE Anthon A. Leonard, Glenslde, Pa,. assignor to Philadelphia Storage delphia, Pa., a corpor Battery Company, Philaation of Pennsylvania Application January 13, 1932, swarm. 586,389

Claims. (01401-63) This invention relates to protective devices for connecters and has particular reference to devices of the class disclosed and claimed in a'copending application of John M. Bowman, Serial v security for the terminal connections.

The following description and the accompanying drawing discloses the invention as applied to the particular form of device forming the subject matter of the above-mentioned co-pending application. It is to be understood, however, that the invention is thus not limited in scope but is capable of general application. In the draw- Fig. 1 is a schematic illustration of a suppressor 26 or resistor device in connection with the associated parts of a motor vehicle equipped with a radio receiver; and

Fig. 2 is a sectional view clearly illustrating the invention.

Without limiting its applicability, the invention is illustrated herein as applied to the specific device for which it is intended, as indicated above. For the purpose of the present description, it suffices to state that suppressor resistor elements are interposed in the spark plug lead or supply conductor of a motor vehicle equipped with a radio receiver, the purpose of the resistor being to prevent disturbances originating in the ignition system of the vehicle from interfering with the normal operation of the radio receiver. Fig. 1 illustrates this arrangement clearly, wherein I designates the usual cylinder head of a motor vehicle. 2 designates a spark plug thereof. 3 and l are sections of the spark plug conductor, and 5 is the suppressor resistor element with the novel device of the invention applied thereto.

Referring to Fig. 2, wherein the invention is illustrated in detail and the elements in. Fig. 1 have been given like reference characters, the

suppressor resistor is shown at 8 and takes the' usual cylindrical form of such elements. In accordance with the Bowman device, mechanical and electrical connection of conductor sections 3 and l is made to the ends of terminals of element 5. To this end. a pointed screw 1 having sharp threads is attached to each end of the resistor element. Preferably, the screw resembles an ordinary wood screw, and a cup-shaped retainer 8,'which may be made of brass, serves to retain the screw by engaging the flanged head 9 thereof. The shank of the screw extends through the apertured opening ill in the bottom of retainer 8. The retainer is of such dimension that the end of the resistor element fits nicely therein. Preferably, a layer of steel wool H or other con- 10 ductive spring is interposed between the head of the screw and the resistor element. A binding of cement I! or like substance serves to attach retainer 8 to the resistor element securely. It will be understood that both ends of the device 5 are formed as described.

As illustrated clearly in Fig. 2, the usual insulated stranded conductor used for spark plug conductors and other purposes may be readily con-- nected to the device by merely screwing the 20 threaded shank of screw I into the end of the stranded conductor longitudinally thereof. The individual strands of the conductor interlock firmly with the screw threads to provide a very eflicient mechanical and electrical connection. 25

In accordance with the present invention, in order to enhance the efficiency of operation of the device described above. I provide a protective sleeve l3 which may be formed of any suitable insulating material such as porcelain. This 30 sleeve is of such internal diameter that it closely encircles the assembled elements and it is of r such length that it completely covers the resistor element as well as the electrical joints orconnections. The sleeve is preferably applied be- 5 fore cement l2 hardens so that the cement firmly adheres to the internal surface of the sleeve and thus secures it in position. It is further to be noted that screw 1 expands the conductor and its insulation. thus jamming or wedging the insulated conductor in the sleeve. This enhances the efficiency of the device from the standpoint of electrical connection and mechanical security.

Obviously, the sleeve completely shields the various elements from the accumulation of foreign substances which might otherwise detrimentally affect the operation by causing a short by-pass of relatively low impedance about a resistor. The sleeve also enhances the appearance of the device and makes 50 it mechanically stronger as will be obvious.

The construction of the sleeve may, of course, be modified in details and it is to be understood that only the limitations contained in the appended claims are to limit the invention. 55

I claim: elementin said tube, an insulated conductor fitted 1. A resistance device comprising an imperviinto an end 01' said tube, metal terminals carried ous tube of non-conducting material, a resistby the tube and in electrical contact yith the once element in said tube, an insulated conductor respective ends of said element, one of said ter- 10 having a tapering axial projection for engage moisture proof seal therewith. I0

15 prootseai therewith. by the tube and in electrical contact with the 15 2. A resistance device comprising an ,impervirespective ends of said element. one or said termious tube 01' non-conducting material, a resistance nlls havint a 89 11!!! xi Dmj c n or nelement in said tube, an insulated conductor casement with the conducting core or said infltted into an end or said tube. metal terminals. sulated conductor fitted into an end of said tube 20 carried by the tube and in electrical contact with to Wedge the insulation 01' the conductor silainst 20 25 with the conducting core of saidinsulated conand a tapered member electrically connected 2!! to end of said tube. expands the Insulation of said conductor and a0 3. A resistance device comprising an lmpervi- Jams it against the inner wall of said sleeve. I ous tube oi non-conducting material, a resistance ANTHON A. LEONARD. 

